... and seller of the erw steel pipe.Some detailed information:1. Standard: GB, ASTM, API2. Material: Q195, Q235, Q345, X42, ... Africa Mid East Western Europe Eastern Asia More detailed information: api spec 5ct oil casing and tubing Outer Diameter10 ... 15m ,as customer’s requiremntsInternatioanal StandardISO 9000-2001StandardsASTMA53,BS1387-1985,GB/T3091-2001,EN39,BS1139MaterialsQ195, Q215, Q235, Q345, X42, ...